Refering to the level of gameplay a person has reached in his most recent RPG game.

Level 1: Has beaten it once.
Level 2: Has beaten it twice and has attended a fan club meeting or convention.
Level 3: Has beaten it so many times that the programmers call him for advice.
Level 4: Is the president of the RGS's fan club.

Nigel hasn't been out of his house in three days! His nerd level must be through the roof!

Ranked on a scale of nerdiness from 1 to 5. 1 being generally accepted, and 5 being social reject/basement dweller. Anime ranking 4, and Star Trek a 3.5. An exception being Babylon 5, which is a whopping 4.5 on the scale.

Frequently presented with a number added. Nerd Level is a way of quantifying nerdiness, measured in social outcast tiers.

Essentially, most people you would meet are level 0 nerds. The people they feel uncomfortable around due to excessive nerdiness are level 1 nerds. The level 1 nerds feel uncomfortable around nerds of 2nd or higher level, etc.

A quatifying degree commonly refered to by a numeral or a level there of. These "levels" if you well represent the intensity of the subject rejectivness to society. Higher the level represent a mass quatifier of rejection.